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AI Visibility Index · September 2026

Gyms in London that AI assistants recommend

We asked ChatGPT, Claude, Gemini and Grok the four questions a buyer asks when looking for gyms in London, three times each, in English, and counted who they named. These are the businesses named in two or more of the 48 answers.

Check whether AI names youSee the ranking

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

Gyms · London
73%of answers named Virgin Active
Answers
48
Businesses named
23
Named only once
4
Named by 2+ assistants
15 of 19
Named again on a rerun
71%

Edition September 2026. Download the data

Asked for gyms in London, ChatGPT, Claude, Gemini and Grok most often named Virgin Active (73% of answers), Third Space (65%) and PureGym (60%). Across 48 answers they named 23 different businesses, 4 of them only once. Each of four buyer questions was asked three times, in English, in September 2026.

The ranking

Share is the fraction of the 48 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Gyms in London named by AI assistants, September 2026
#BusinessShareChatGPTClaudeGeminiGrokQuestionsAvg. position
1Virgin ActiveAlso written Virgin Active London, Virgin Active London Aldine Place73%95%: 59 to 83%75%67%58%92%4 of 43.1
2Third SpaceAlso written Third Space Soho65%95%: 50 to 77%67%67%75%50%3 of 41.8
3PureGymAlso written PureGym London60%95%: 46 to 73%58%58%75%50%3 of 42.5
4The Gym GroupAlso written The Gym Group London44%95%: 31 to 58%50%50%42%33%2 of 43
5Gymbox44%95%: 31 to 58%67%42%67%0%4 of 43.8
6Nuffield Health Fitness & WellbeingAlso written Nuffield Health Fitness & Wellbeing Gyms, Nuffield Health Fitness & Wellbeing London, Nuffield Health Fitness & Wellbeing Centre Barbican, Nuffield Health Fitness & Wellbeing Centres38%95%: 25 to 52%75%75%0%0%4 of 42.8
7EquinoxAlso written Equinox London29%95%: 18 to 43%8%8%75%25%3 of 42.6
8Barry'sAlso written Barry's UK, Barry's London, Barry's Bootcamp, Barry’s Bootcamp London19%95%: 10 to 32%25%8%25%17%1 of 42.6
9F45 TrainingAlso written F45 Training London19%95%: 10 to 32%17%8%25%25%1 of 44.8
10Bannatyne Health ClubAlso written Bannatyne Health Club & Spa, Bannatyne Health Club & Spa City of London15%95%: 7 to 27%0%25%33%0%3 of 44.4
11Nuffield Health13%95%: 6 to 25%0%0%50%0%2 of 43.5
12BetterAlso written Better Leisure Centres, Better Gyms, Better leisure centres London13%95%: 6 to 25%8%25%17%0%2 of 44.7
13Fitness First10%95%: 5 to 22%25%8%0%8%2 of 44.8
14David LloydAlso written David Lloyd Clubs8%95%: 3 to 20%0%0%0%33%2 of 43.3
15Psycle6%95%: 2 to 17%0%0%25%0%1 of 43.7
161Rebel4%95%: 1 to 14%17%0%0%0%2 of 42.5
17BLOKAlso written BLOK London4%95%: 1 to 14%8%8%0%0%1 of 43
18BXR London4%95%: 1 to 14%0%8%8%0%1 of 43
19Anytime Fitness4%95%: 1 to 14%0%0%8%8%1 of 44

Each assistant column is the share of that assistant's own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 4 more names came up in a single answer and are counted above but not listed.

What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#ChatGPTClaudeGeminiGrok
1Virgin Active75%Nuffield Health Fitness & Wellbeing75%Third Space75%Virgin Active92%
2Nuffield Health Fitness & Wellbeing75%Virgin Active67%PureGym75%Third Space50%
3Third Space67%Third Space67%Equinox75%PureGym50%
4Gymbox67%PureGym58%Gymbox67%The Gym Group33%
5PureGym58%The Gym Group50%Virgin Active58%David Lloyd33%

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing
Named by AI assistants: Gyms in London, AIGROW AI Visibility Index, September 2026
<a href="https://aigrow.gg/index/gyms/london"><img src="https://aigrow.gg/badges/index/2026-09/gyms/london.svg" width="312" height="100" alt="Named by AI assistants: Gyms in London, AIGROW AI Visibility Index, September 2026"></a>

The questions

Asked word for word, three times each, to every assistant through its API. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

  1. 1What is the best gym in London?
  2. 2I want to join a gym in London. Which ones would you recommend?
  3. 3Which gym in London is good for beginners?
  4. 4Where can I find a gym in London with good group classes?

How to read this page

The full method
What it measures
Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter
48 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings
Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong
If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Elsewhere in the Index

Gyms elsewhere
BirminghamBristolEdinburghGlasgowLeedsManchester
Also in London
DentistsLawyersAccountantsPlumbersReal estate agenciesRestaurants

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Edition September 2026 · data under CC BY 4.0